Neelix believed that Parsons was possessed by the Komar. The Talaxian's reasoning was that Parsons liked his pejuta hot and with lemon, and that his recent order was for cold Pejuta without lemon, therefore he might not be the same person. (VOY: "Cathexis")

In 2373, Parsons suffered from a microbial infection. The Doctor set up a culture of his glial cells to do an immunogenicity analysis, but was too distracted with his holographic family, so Kes did the tests instead. (VOY: "Real Life")